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Arc-oblique fault systems: their role in the Cenozoic structural evolution and metallogenesis of the Andes of central Chile

Citation

Piquer, J and Berry, RF and Scott, RJ and Cooke, DR, Arc-oblique fault systems: their role in the Cenozoic structural evolution and metallogenesis of the Andes of central Chile, Journal of Structural Geology, 89 pp. 101-117. ISSN 0191-8141 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Elsevier Ltd.

DOI: doi:10.1016/j.jsg.2016.05.008

Abstract

The evolution of the Main Cordillera of Central Chile is characterized by the formation and subsequent inversion of an intra-arc volcano-tectonic basin. The world’s largest porphyry Cu-Mo deposits were emplaced during basin inversion. Statistically, the area is dominated by NE- and NW-striking faults, oblique to the N-striking inverted basin-margin faults and to the axis of Cenozoic magmatism. This structural pattern is interpreted to reflect the architecture of the pre-Andean basement. Stratigraphic correlations, syn-extensional deposits and kinematic criteria on fault surfaces show several arc-oblique structures were active as normal faults at different stages of basin evolution. The geometry of syn-tectonic hydrothermal mineral fibers, in turn, demonstrates that most of these structures were reactivated as strike-slip ± reverse faults during the middle Miocene – early Pliocene. Fault reactivation age is constrained by 40Ar/39Ar dating of hydrothermal minerals deposited during fault slip. The abundance and distribution of these minerals indicates fault-controlled hydrothermal fluid flow was widespread during basin inversion. Fault reactivation occurred under a transpressive regime with E- to ENE-directed shortening, and was concentrated around major plutons and hydrothermal centers. At the margins of the former intra-arc basin, deformation was largely accommodated by reverse faulting, whereas in its central part strike-slip faulting was predominant.

Item Details

Item Type:Refereed Article
Keywords:Andes, central Chile, cenozoic, kinematic and dynamic analysis
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural Geology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Piquer, J (Mr Jose Piquer Romo)
Author:Berry, RF (Associate Professor Ron Berry)
Author:Scott, RJ (Dr Robert Scott)
Author:Cooke, DR (Professor David Cooke)
ID Code:109397
Year Published:2016
Web of Science® Times Cited:2
Deposited By:CODES ARC
Deposited On:2016-06-14
Last Modified:2017-11-02
Downloads:0

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